Analogies about technology

Sideways Dictionary uses analogies to explain technology. You can contribute your own, upvote those you like or downvote those you don’t find helpful. Here’s one to describe API: “It’s like a LEGO brick. An application without an API is like a LEGO brick without nodules (are they called nodules?) – it’s not much fun and you can’t build anything new with it.” — by Nick Asbury. — CD